In the shade of a tree close to the slow waters of the White Nile river, a body killed during the fighting over South Sudan’s town of Bor gathers flies. On the bumpy road towards the heavily fortified compound of the United Nations...

United Nations chief Ban Ki-moon has warned warring factions in South Sudan that reports of crimes against humanity will be investigated, as eyewitnesses spoke of a wave of brutal ethnic killings. The secretary general asked the Security Council...